Added new files resulting from directory restructuring.

[pspp-builds.git] / src / language / utilities / permissions.c

diff --git a/src/language/utilities/permissions.c b/src/language/utilities/permissions.c
new file mode 100644 (file)
index 0000000..05a503c
--- /dev/null
+++ b/src/language/utilities/permissions.c
@@ -0,0 +1,128 @@
+/* PSPP - computes sample statistics.
+   Copyright (C) 2004 Free Software Foundation, Inc.
+   Author: John Darrington
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA. */
+
+#include <config.h>
+#include "message.h"
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include "settings.h"
+#include "command.h"
+#include "message.h"
+#include "lexer.h"
+#include "misc.h"
+#include "stat-macros.h"
+#include "str.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+enum PER {PER_RO, PER_RW};
+
+int change_permissions(const char *filename, enum PER per);
+
+
+/* Parses the PERMISSIONS command. */
+int
+cmd_permissions (void)
+{
+  char  *fn = 0;
+
+  lex_match ('/');
+
+  if (lex_match_id ("FILE"))
+    lex_match ('=');
+
+  fn = strdup(ds_c_str(&tokstr));
+  lex_force_match(T_STRING);
+
+
+  lex_match ('/');
+  
+  if ( ! lex_match_id ("PERMISSIONS"))
+    goto error;
+
+  lex_match('=');
+
+  if ( lex_match_id("READONLY"))
+    {
+      if ( ! change_permissions(fn, PER_RO ) ) 
+       goto error;
+    }
+  else if ( lex_match_id("WRITEABLE"))
+    {
+      if ( ! change_permissions(fn, PER_RW ) ) 
+       goto error;
+    }
+  else
+    {
+      msg(ME, _("Expecting %s or %s."), "WRITEABLE", "READONLY");
+      goto error;
+    }
+
+  free(fn);
+
+  return CMD_SUCCESS;
+
+ error:
+
+  free(fn);
+
+  return CMD_FAILURE;
+}
+
+
+
+int
+change_permissions(const char *filename, enum PER per)
+{
+  struct stat buf;
+  mode_t mode;
+
+  if (get_safer_mode ())
+    {
+      msg (SE, _("This command not allowed when the SAFER option is set."));
+      return CMD_FAILURE;
+    }
+
+
+  if ( -1 == stat(filename, &buf) ) 
+    {
+      const int errnum = errno;
+      msg(ME,_("Cannot stat %s: %s"), filename, strerror(errnum));
+      return 0;
+    }
+
+  if ( per == PER_RW )
+    mode = buf.st_mode | S_IWUSR ;
+  else
+    mode = buf.st_mode & ~( S_IWOTH | S_IWUSR | S_IWGRP );
+
+  if ( -1 == chmod(filename, mode))
+
+    {
+      const int errnum = errno;
+      msg(ME,_("Cannot change mode of %s: %s"), filename, strerror(errnum));
+      return 0;
+    }
+
+  return 1;
+}